\begin{tikzpicture}
    \tkzDefPoints{0/0/B, 3.5/0/C}
    \tkzDefTriangle[two angles=40 and 70](B,C)  \tkzGetPoint{A}
    \tkzDefTriangle[two angles=-40 and -70, swap](A,C)  \tkzGetPoint{D}

    \tkzDrawPolygon(A,B,C)
    \tkzDrawSegments(A,D)
    \tkzMarkAngles[size=0.3](C,B,A  D,A,C)
    \tkzLabelPoints[above](A)
    \tkzLabelPoints[below](B,C,D)
\end{tikzpicture}
